body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

nav {
  background-color: #333;
}

nav ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
}

nav ul li {
  display: inline-block;
}

nav ul li a {
  display: block;
  padding: 15px 20px;
  text-decoration: none;
  color: #fff;
}

nav ul li a:hover {
  background-color: #555;
}